Loads of lovely examples and vivid analogies. The sidebar on races is surprisingly careful and illuminating - that portion of the phenomenon that's genetic is more straightforward than I’d thought, in my Arts student way. (Though his placid definitiveness about the social interpretation is obvs controversial as hell. He’s a strict philosophical eliminativist, implying that the harm resulting from reifying race totally outweighs all gains from positive discrimination. This is unclear to say the least.) I hadn’t heard of the ‘two-fold cost’ of sex before, super-interesting. Not as snarky as you’d expect, and full of alternative perspectives so long as they’re other evolutionists’ perspectives.